As the MBTA nears its deadline to finalize next year’s budget, transportation officials ­detailed more clearly Tuesday how they plan to close the multimillion-­dollar operating deficit, a strategy that will probably include fare increases and defer­ring preventive maintenance.

T officials hope
the austerity measures will not be necessary: Governor Deval Patrick’s proposed transportation funding plan would provide a $166 million injection ­into next year’s operating costs. But it will be months before legislators vote on the plan, and the T’s budget deadline is April 10.

In its budget plan, the Massa­chusetts Bay Transportation Authority will probably ­defer $45 million in upkeep on trains and stations for a year, General Manager Beverly A. Scott said Tuesday, with the hope that the agency will be able to squeeze by until it has more funding.

“I’m praying it’s a timing and figuring-it-out issue,” Scott said.

Though the T’s official deficit stands at $140 million, an estimated increase in ridership, which brings additional revenue from fares, and new initiatives such as digital ads in T stations have narrowed the gap to about $117 million.

Other budget-balancing measures, Scott said, have been tailored with the hope that lawmakers will approve further state funding. Rather than curtailing service hours, the T would rely heavily on fare ­increases, she said, which could be rolled back if state funding becomes available.

Less popular bus routes would probably be cut, she said.

Squeezing by at the MBTA

Fare increases would spread the cost-cutting measures more evenly among riders, Scott said, though it could have a greater impact on senior citizens and those with disabilities.